'use strict'

/*
 * FileSaver.js
 * A saveAs() FileSaver implementation.
 *
 * By Eli Grey, http://eligrey.com
 *
 * License : https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md (MIT)
 * source  : http://purl.eligrey.com/github/FileSaver.js
 */
// The one and only way of getting global scope in all environments
// https://stackoverflow.com/q/3277182/1008999
var _global =
  typeof window === 'object' && window.window === window
    ? window
    : typeof self === 'object' && self.self === self
    ? self
    : typeof global === 'object' && global.global === global
    ? global
    : void 0

function bom(blob, opts) {
  if (typeof opts === 'undefined')
    opts = {
      autoBom: false
    }
  else if (typeof opts !== 'object') {
    console.warn('Deprecated: Expected third argument to be a object')
    opts = {
      autoBom: !opts
    }
  } // prepend BOM for UTF-8 XML and text/* types (including HTML)
  // note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF

  if (
    opts.autoBom &&
    /^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(
      blob.type
    )
  ) {
    return new Blob([String.fromCharCode(0xfeff), blob], {
      type: blob.type
    })
  }

  return blob
}

function download(url, name, opts) {
  var xhr = new XMLHttpRequest()
  xhr.open('GET', url)
  xhr.responseType = 'blob'

  xhr.onload = function() {
    saveAs(xhr.response, name, opts)
  }

  xhr.onerror = function() {
    console.error('could not download file')
  }

  xhr.send()
}

function corsEnabled(url) {
  var xhr = new XMLHttpRequest() // use sync to avoid popup blocker

  xhr.open('HEAD', url, false)

  try {
    xhr.send()
  } catch (e) {}

  return xhr.status >= 200 && xhr.status <= 299
} // `a.click()` doesn't work for all browsers (#465)

function click(node) {
  try {
    node.dispatchEvent(new MouseEvent('click'))
  } catch (e) {
    var evt = document.createEvent('MouseEvents')
    evt.initMouseEvent(
      'click',
      true,
      true,
      window,
      0,
      0,
      0,
      80,
      20,
      false,
      false,
      false,
      false,
      0,
      null
    )
    node.dispatchEvent(evt)
  }
} // Detect WebView inside a native macOS app by ruling out all browsers
// We just need to check for 'Safari' because all other browsers (besides Firefox) include that too
// https://www.whatismybrowser.com/guides/the-latest-user-agent/macos

var isMacOSWebView =
  _global.navigator &&
  /Macintosh/.test(navigator.userAgent) &&
  /AppleWebKit/.test(navigator.userAgent) &&
  !/Safari/.test(navigator.userAgent)
var saveAs =
  _global.saveAs || // probably in some web worker
  (typeof window !== 'object' || window !== _global
    ? function saveAs() {}
    : /* noop */
    // Use download attribute first if possible (#193 Lumia mobile) unless this is a macOS WebView
    'download' in HTMLAnchorElement.prototype && !isMacOSWebView
    ? function saveAs(blob, name, opts) {
        var URL = _global.URL || _global.webkitURL
        var a = document.createElement('a')
        name = name || blob.name || 'download'
        a.download = name
        a.rel = 'noopener' // tabnabbing
        // TODO: detect chrome extensions & packaged apps
        // a.target = '_blank'

        if (typeof blob === 'string') {
          // Support regular links
          a.href = blob

          if (a.origin !== location.origin) {
            corsEnabled(a.href)
              ? download(blob, name, opts)
              : click(a, (a.target = '_blank'))
          } else {
            click(a)
          }
        } else {
          // Support blobs
          a.href = URL.createObjectURL(blob)
          setTimeout(function() {
            URL.revokeObjectURL(a.href)
          }, 4e4) // 40s

          setTimeout(function() {
            click(a)
          }, 0)
        }
      } // Use msSaveOrOpenBlob as a second approach
    : 'msSaveOrOpenBlob' in navigator
    ? function saveAs(blob, name, opts) {
        name = name || blob.name || 'download'

        if (typeof blob === 'string') {
          if (corsEnabled(blob)) {
            download(blob, name, opts)
          } else {
            var a = document.createElement('a')
            a.href = blob
            a.target = '_blank'
            setTimeout(function() {
              click(a)
            })
          }
        } else {
          navigator.msSaveOrOpenBlob(bom(blob, opts), name)
        }
      } // Fallback to using FileReader and a popup
    : function saveAs(blob, name, opts, popup) {
        // Open a popup immediately do go around popup blocker
        // Mostly only available on user interaction and the fileReader is async so...
        popup = popup || open('', '_blank')

        if (popup) {
          popup.document.title = popup.document.body.innerText =
            'downloading...'
        }

        if (typeof blob === 'string') return download(blob, name, opts)
        var force = blob.type === 'application/octet-stream'

        var isSafari =
          /constructor/i.test(_global.HTMLElement) || _global.safari

        var isChromeIOS = /CriOS\/[\d]+/.test(navigator.userAgent)

        if (
          (isChromeIOS || (force && isSafari) || isMacOSWebView) &&
          typeof FileReader !== 'undefined'
        ) {
          // Safari doesn't allow downloading of blob URLs
          var reader = new FileReader()

          reader.onloadend = function() {
            var url = reader.result
            url = isChromeIOS
              ? url
              : url.replace(/^data:[^;]*;/, 'data:attachment/file;')
            if (popup) popup.location.href = url
            else location = url
            popup = null // reverse-tabnabbing #460
          }

          reader.readAsDataURL(blob)
        } else {
          var URL = _global.URL || _global.webkitURL
          var url = URL.createObjectURL(blob)
          if (popup) popup.location = url
          else location.href = url
          popup = null // reverse-tabnabbing #460

          setTimeout(function() {
            URL.revokeObjectURL(url)
          }, 4e4) // 40s
        }
      })
_global.saveAs = saveAs.saveAs = saveAs

export default saveAs
